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Universal pion freeze-out in heavy-ion collisions

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Rak,  J.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Wurm,  J. P.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Adamova, D., Agakichiev, G., Appelshauser, H., Belaga, V., Braun-Munzinger, P., Castillo, A., et al. (2003). Universal pion freeze-out in heavy-ion collisions. Physical Review Letters, 90(2): 022301, pp. 022301-022301.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-8F77-7
Abstract
Based on an evaluation of data on pion interferometry and on particle yields at midrapidity, we propose a universal condition for thermal freeze-out of pions in heavy-ion collisions. We show that freeze-out occurs when the mean free path of pions lambda(f) reaches a value of about 1 fm, which is much smaller than the spatial extent of the system at freeze- out. This critical mean free path is independent of the centrality of the collision and beam energy from the Alternating Gradient Synchrotron to the Relativistic Heavy Ion Collider.